david small. Just another vague description which wouldn't impress the average person. But three years ago I saw a black sphere, silent and only a hundred or so feet above my back garden in a clear blue sky. No sound, no vapour trail, no sparks or glows or wings - moving steadily in a straight line without deviation; no amazing direction changes. Completely boring, except that I've never seen anything like it. It went out of my field of view when it went over the house roof, and whn I had run through the house there was no longer any sign of it. The simple theory is that it was some kind of drone, but it was rally un-drone-like in that there was no sound.